Valve membrane



FIG. 1 is a top perspective view of a valve membrane, showing my new design;

FIG. 2 is a perspective view thereof from below;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a cross sectional view thereof;

FIG. 7 is a top perspective view of a second embodiment of a valve membrane;

FIG. 8 is a perspective view thereof from below; and,

FIG. 9 is a bottom plan view thereof. 

The ornamental design for a valve membrane, as shown and described. 